Headwall for road culverts



April 28, 1953 J. ALGER 2,636,352

HEADWALL FOR ROAD CULVERTS Filed Feb. 25, 1950 IN VEN TOR. JoH/ A1. GER

ATTORNEY Patented Apr. 28, 1953 HEADWALL For: ROAD CULVERTS- John Alger, Lakewood, 0010.

Application February 23, 1950, Serial No; 145,820 3 Claims. (01. 61-1-16) This invention relates to a pre-cast concrete like. A conventional roadway underdrain is usually formed by burying a corrugated metal cullvert pipe in the. roadway; forms for a headwall at each extremity of said building concrete headwall for pipe culverts for roadways and the This procedure is arelaprovide a pre-cast concrete headwall which can be manufactured in quantities at a central loca-.- tion, thence delivered to the job and slipped over each extremity of a culvert pipe, so as to elimiincline of said pipe, and regardless of the angle at which the pipecrosses the roadway.

A further object is to provide a pre-cast concrete culvert headwall with side walls orwings which can be adjusted to any desired angle to the face of the headwall, and then permanently secured in place; and to provide means for permanently securing the headwall to the conventional corrugated culvert pipe.

Other objects and advantages. reside in the detail construction of the inventiongwhichjs designed for simplicity, economy, and efficiency.

is designed.

ends of the pipe and to direct drainage water through the pipe. Headwalls of this typfi are at present cast in place by means of forms which are built up and dismantled for each job. This invention avoids the expense of building forms on each separate job, and provides a pre-cast headwall which can be manufactured at a central point and distributed to the points of use without requiring forms. The invention comprises a solid headwall block "Ill of reinforced concrete having a central opening ll therethrough. The diameter of the opening H is less than the outer diameter of the particular culvert pipel2'for' which the headwall The forward face of the block [0 inclinesforwardly in its entirety as the bottom is approached. This forward face-of the block, indicated at [3, is concaved conically inward to the opening H from the top, bottom, and two sides of the block ill to provide a relatively flat, funnel- I shaped contour to the front face of the block;

These Wm become e pparent from the following description;

In the following detailed description of the invention, reference is had to the accompanying V The rear face of the block 10 is substantially vertical, arising from a broad base portion I4. A semicircular flange l5 projects rearwardly from the rear face to a position in alignment with the rear face of the base portion l4 and extends concentrically about the opening H. The inside face of the flange i5 is inclined inwardly to provide ;a conical socket IS in the rear face of the block. The smaller-diameter of the conical socket-is larger than the diameter of the central opening ll 50 that a shoulder I1 is formed about the opening at the rear of the block.

Nut tubes [8 are cast in the flange portion l5, and each supports a nut I9 through which a culvert clamp screw 20 is threaded. The culvert Fig. 6 is an enlarged, detail view of a culvert holding screw employed in the invention; and

Fig. '7 is a cross-section, taken on the line 7-l, Fi 2.

The improved pre-cast headwall is designed to t clamp screws 20 are rotatably mounted in arcuate yoke members 2! at their inner extremities,

. and are provided with screw driver slots 22, or

other turning means, at their outer extremities.

The conical socket I6 is designed to allow the culvert pipe I 2 to approach the headwall block I 0 at any desired horizontal angle, as shown in broken line at A in Fig. 1, or at any desired vertical angle, as shown at B in Fig. 2.

When installing the improved headwall, the extremities of the culvert pipe l2 are cut on vertical planes parallel to the axis of the roadway, regardless of the angle or position of the culvert pipe. The headwall blocks are then slipped over the extremities of the culvert pipe until the latter rest against the shoulders I! about the openings H. The pipe is then sealed to, and secured in, the headwalls by tightening the screws 20 until the yokes 2| are brought securely against the pipe extremities. The extremities are then grouted permanently into place in the headwalls by completely filling the conical sockets IS with cement grout completely around the extremities of the culvert pipe.

In certain installations it is desirable to have side walls or wings on the headwall to hold back and protect the earth fill. Such installations are accommodated in the present invention by providing two" substantially triangular, pr'e cast, reinforced concrete wings 23. The wings 23 are hingedly mounted at each end of the headwall block [0 upon vertical hinge rods 24 ex tending through vertical receiving pipes 425 which are cast into the wings 23 at the time of manefacture.

The extremities of the rods 24 are heldyin upper and lower eye bolts 26: The eye bolts Having thus described the invention, what is flaimed and desired secured by Letters Patent 1. A pre-cast headwall unit for application to the extremity of a culvert pipe, comprising: a pre-cast headwall block having a medial opening in its forward face; a circular socket in the rear face of said block, said socket being concentric with and communicating with said opening", thTerar apes extremity of said socket being of greater diameter than the forward extremity thereof to form a conical wall about said socket;

' Y "aishoulder about the rear extremity of said open- ,ing, therforward extremity of said socket being ofgreat'er diameter than said opening to form .said shoulder, said shoulder being adapted to receive the extremity of said pipe; and means extend into eye bolt tubes 2'! which are pre-cast;

into the ends of the headwall block Hi and are threaded through nuts 28 welded .or other: Wise permanently 's ecur'edlin the outer ez'ztriemities of: the tubes 27; The. inner extremities. of the Wings 23 are rounded about the axis" of the pipes 25, as shown at 3!, so that they' will remain in close proximity to the block iii at any angle. V

The eye bolts 26 and the hinge rod 24 are only for the purpose of providing installation supportfor the wings 23, for after the ins'tallation has been set in place,v the end walls are granted into the head-wall ill by filling the notches formed by the rounded ends 3! so that the entire structurelbec'omes a rigid, inseparable unit. Two lit-ting tubes 29 are cast into the .upper surface of the block [0' andprovided with nuts 30',- s'imilarly to the tubes 21. The eye bolts it can 'beremove'd from the tubes". 2'! and'threaded throu h the nuts 30 so as to project upwardly fromthe block 10; as shown in broken line in Fig. 3, to provide means for attaching a'hoi'st sling to the block whereby it' may be lowered into its final place.- The eye bolts 26' can then be removed and used for supporting the side wings 23,- as before described. Y

While a specific form of the improvement has been-described and illustrated herein, it is to be understood that the same may be varied, within the scope of the appended claims, without .de'i- I parting from the spirit of the invention.

adapted tdconta'et' said pipe so as to maintain the latter concentric with said opening, said conical wall acting to allow said pipe to approach said shoulder at an acute angle tromanydircctiomto. the plane of said shoulder. j

2, A prercast headwalluiiit for apmicatioure the extremity or aiculyert pipe as described in claim 1 having set screwsmounted in said block and extending'int'o said socket a plane paral ll to the plane .of said shoulder' and adaptedto en age said pipe so as to maintain the lattrin saidsocket.

3. a pre-cast head-wail unit as descri ed im clai1n2 in which the securing means comprises a plur'alityof clamp screws extending fror'iis'aid block radially into said socket; and a. yuk'e meme her on, each. clamp screw held in gripping easement with said prpe'py its respeetivieeiariiiz SCIGW. I 4 4 OHNALGER.'

. Refafies Ci d t e 6:" as v UNITE-:13 STATES PATENTS- Number 413,641 Bah'bit't'et a1; 0st; 291- i389 vaaosa Simpson Mar".- 28,1905 1,144,200 Hewett June 22, 1915 1,225,777 Graig May 1-5; 191? 1,479,352: 'Wittefi Jan. I-,- 1924 1,593,4sa Dir'riic'k r: auiy'zo; 1926 1,620,089 Fischer 83 N32? -i=,s 32,3ss Sullivan n nav. 11 1931 '2,0.-1,267 seureeaer, Jr. b --Msy19 ,-19ss 

